I have a Mac Pro:
Model Identifier: MacPro1,1 Processor Name: Dual-Core Intel Xeon
I was using a cheap eSata PCIe card that used the sii3132 drivers to run an Edgestore DAS200 under Leopard and all was well.
Apparently Snow Leopard doesn't like the drivers, so rather than risk my Data I'm now running the DAS200 via USB.
I wonder if anyone can recommend from personal experience a reasonably priced (UK available) PCIe eSATA card that is compatible with Snow Leopard?